Stable isotope low-temperature separation and concentration device and technology

Abstract

The invention relates to a stable isotope low-temperature separation and concentration device and technology. The technology comprises the following steps that purified high-purity feed gas enters a low-temperature separation and concentration device formed by the series connection of n difunctional composite separation towers from a buffer tank through pump metering, and each tower top provides an initial liquid phase of the tower corresponding to a condenser; and each tower bottom provides an initial vapor phase of the tower corresponding to a reboiler, vapor and liquid are in countercurrentcontact in each tower, two processes of isotope exchange reforming and vapor-liquid rectification are continuously and alternately carried out, a heavy isotope product is continuously produced at thelast nth-stage tower bottom through pump metering, and waste gas subjected to heavy isotope separation is continuously produced at the first-stage tower top condenser through pump metering. The device is a cascade system formed by connecting n bifunctional composite separation towers which are horizontally arranged in series, and each bifunctional composite separation tower is composed of m towersections; and the device and the technology effectively overcome the defects of single function and the like of the separation tower in the traditional low-temperature rectification process, reduce the number of cascaded towers, simplify the process and save the energy consumption.

Description

[technical field] [0001] The invention relates to the technical field of separation and concentration of stable isotopes, in particular to a stable isotope low-temperature separation and concentration device and process. [Background technique] [0002] There are many methods for separating and concentrating stable isotopes. In the early days, there were mainly thermal diffusion method, electrolysis method, laser method, centrifugation method and adsorption method. The production capacity is also on a small scale of hundreds of grams, and it is mainly used for tracer applications in the research field; With the widespread use of stable isotopes in medicine, pharmaceuticals, life sciences, nuclear power, and chemistry, chemical exchange and distillation have become the main technologies for separating and concentrating stable isotopes, with an annual output of hundreds of kilograms; Among the categories of rectification methods, cryogenic rectification methods mainly include t...

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Problems solved by technology

[0017] The purpose of the present invention is to solve the above-mentioned deficiencies and provide a stable isotope low-temperature separation and concentration device and process with simple process, few cascades, and high separation and concentration efficiency, which overcomes the shortcomings of the single rectification function of the traditional isotope low-temperature separation tower

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